Precise measurement of the K-+/-->pi(+/-)e(+)e(-) decay
- J. R., Batley
- A. J., Culling
- G., Kalmus
- C., Lazzeroni
- D. J., Munday
- M. W., Slater
- S. A., Wotton
- R., Arcidiacono
- G., Bocquet
- N., Cabibbo
- A., Ceccucci
- D., Cundy
- V., Falaleev
- M., Fidecaro
- L., Gatignon
- A., Gonidec
- W., Kubischta
- A., Norton
- A., Maier
- M., Patel
- A., Peters
- S., Balev
- P. L., Frabetti
- E., Goudzovski
- P., Hristov
- V., Kekelidze
- V., Kozhuharov
- L., Litov
- D., Madigozhin
- E., Marinova
- N., Molokanova
- I., Polenkevich
- Y., Potrebenikov
- S., Stoynev
- A., Zinchenko
- E., Monnier
- E., Swallow
- R., Winston
- P., Rubin
- A., Walker
- W., Baldini
- A. C., Ramusino
- P., Dalpiaz
- C., Damiani
- M., Fiorini
- A., Gianoli
- M., Martini
- F., Petrucci
- M., Savrie
- M., Scarpa
- H., Wahl
- A., Bizzetti
- M., Calvetti
- E., Celeghini
- E., Iacopini
- M., Lenti
- F., Martelli
- G., Ruggiero
- M., Veltri
- M., Behler
- K., Eppard
- K., Kleinknecht
- P., Marouelli
- L., Masetti
- U., Moosbrugger
- C. M., Morales
- B., Renk
- M., Wache
- R., Wanke
- A., Winhart
- D., Coward
- A., Dabrowski
- T. F., Martin
- M., Shieh
- M., Szleper
- M., Velasco
- M. D., Wood
- G., Anzivino
- P., Cenci
- E., Imbergamo
- A., Nappi
- M., Pepe
- M. C., Petrucci
- M., Piccini
- M., Raggi
- M., Valdata Nappi
- C., Cerri
- R., Fantechi
- Collazuol, Gianmaria
- L., Dilella
- G., Lamanna
- I., Mannelli
- A., Michetti
- F., Costantini
- N., Doble
- L., Fiorini
- S., Giudici
- G., Pierazzini
- M., Sozzi
- S., Venditti
- B., Bloch Devaux
- C., Cheshkov
- J. B., Cheze
- M. D., Beer
- J., Derre
- G., Marel
- E., Mazzucato
- B., Peyaud
- B., Vallage
- M., Holder
- M., Ziolkowski
- S., Bifani
- C., Biino
- N., Cartiglia
- M., Clemencic
- S. G., Lopez
- F., Marchetto
- H., Dibon
- M., Jeitler
- M., Markytan
- I., Mikulec
- G., Neuhofer
- L., Widhalm
DOIAbstract
A sample of 7253 K+/- -> pi(+/-)e(+)e(-)(gamma) decay candidates with 1.0% background contamination has been collected by the NA48/2 experiment at the CERN SPS, which allowed a precise measurement of the decay properties. The branching ratio in the full kinematic range was measured to be BR = (3.11 +/- 0.12) x 10(-7), where the uncertainty includes also the model dependence. The shape of the form factor W(z), where z = (M-ee/M-K)(2) was parameterized according to several models, and, in particular, the slope delta of the linear form factor W(z) = W-0(1 + delta z) was determined to be delta = 2.32 +/- 0.18. A possible CP violating asymmetry of K+ and K- decay widths was investigated, and a conservative upper limit of 2.1 X 10(-2) at 90% CL w...
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